Function wt::spectrum::spectrum_from_ITU_material

Function Documentation

std::unique_ptr<spectrum_t> wt::spectrum::spectrum_from_ITU_material(std::string id, const std::string &material)

Analytic IOR spectra for long-wavelength scattering for common construction materials. From Table 3 of the Recommendation ITU-R P.2040-2, with Permittivity = a f^b Conductivity = c f^d where f is the EM radiation frequency in GHz. Parameters are given for the following materials: +————————&#8212;+———————————&#8212;+———————–&#8212;+——————–&#8212;+ | Material name | Real part of relative permittivity | Conductivity [S/m] | Frequency range (GHz) |.

  • +—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+ + | | a | b | c | d | | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | vacuum | 1 | 0 | 0 | 0 | 0.001 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | concrete | 5.24 | 0 | 0.0462 | 0.7822 | 1 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | brick | 3.91 | 0 | 0.0238 | 0.16 | 1 &#8212; 40 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | plasterboard | 2.73 | 0 | 0.0085 | 0.9395 | 1 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | wood | 1.99 | 0 | 0.0047 | 1.0718 | 0.001 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | glass | 6.31 | 0 | 0.0036 | 1.3394 | 0.1 &#8212; 100 |

  • +—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | | 5.79 | 0 | 0.0004 | 1.658 | 220 &#8212; 450 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | ceiling_board | 1.48 | 0 | 0.0011 | 1.0750 | 1 &#8212; 100 |

  • +—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | | 1.52 | 0 | 0.0029 | 1.029 | 220 &#8212; 450 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | chipboard | 2.58 | 0 | 0.0217 | 0.7800 | 1 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | plywood | 2.71 | 0 | 0.33 | 0 | 1 &#8212; 40 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | marble | 7.074 | 0 | 0.0055 | 0.9262 | 1 &#8212; 60 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | floorboard | 3.66 | 0 | 0.0044 | 1.3515 | 50 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | metal | 1 | 0 | :math:10^7 | 0 | 1 &#8212; 100 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | very_dry_ground | 3 | 0 | 0.00015 | 2.52 | 1 &#8212; 10 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | medium_dry_ground | 15 | -0.1 | 0.035 | 1.63 | 1 &#8212; 10 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+ | wet_ground | 30 | -0.4 | 0.15 | 1.30 | 1 &#8212; 10 | +————————&#8212;+—————-&#8212;+————-&#8212;+————&#8212;+——-&#8212;+——————–&#8212;+